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10 Top Illusions

Balls that roll uphill, bathtubs that stretch and shrink, freaky faces and throbbing hearts. Welcome to the year's best visual tricks

By Susana Martinez-Conde and Stephen L. Macknik

The Hidden Brain

Flashy neurons may get the attention, but a class of cells called glia are behind most of the brain's work—and many of its diseases

By R. Douglas Fields


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